Floor ventilator



Nov. 24, 1925- 1,562,865 H. L. BROWN FLOOR VENTILATOR Filed June 19, 1925 1' II LL/ W6 x ZIHUQHrOI Patented Nov. 24, 1925.

UNITED STATES PATEN OFFICE.

HERBERT L. BROWN, OF RICHMOND, VIRGINIA.

FLOOR VENTILATOR.

Application filed June 19, 1925. Serial No. 38,246.

certain new and useful Improvements in Floor Ventilators, of which the following 1s a full and clear specification.

This invention hasrelation to that type of ventilator adapted for use in floors, usually floors of comparatively large rooms, such as theaters, auditoriums, schools, etc.

It is known to the trade as the mushroom type of ventilator because of the fact that it embodies a cap or cover convexed upwardly and arranged to cover the ventilating open-, ing. The air passes up through this open ing or down through the opening, as the case may be. tion is to provide simple means for varying the amount of air passing through the device, as more fully hereinafter set forth.

In the drawing Fig. 1 is a perspective viewiof my invention; i

Fig. 2 is a vertical sectional view thereof; Fig. 3 is a detail vertical sectional view showing a slight modification of the anchoring means for the supporting-ring.

Referring to-the drawing annexed by reference-characters, 5 designates the usual airtube extending through the floor and having rigidly attached to its upper end a spiderring 6. this ring being fixed to the tube preferablv by heading the ring with a flange titting therein. Upon the upper edge of the ring is mounted an annular flange 8, and this flange is clamped against the ring by means of a central lag-bolt 9 threaded through the central hub of the spider and having its upper headed end passing through the mushroom-c0ver 10, this) cover being provided with depending notched legs 11engaging the upper end of the flange 8.

By means of the lag-bolt 9, the parts are all clamped inposition on the spider-ring, and to insure proper centering of the flange, the lower edge thereof is bevelled outwardly and upwardly to fit against the correspondingly-bevelled top edge of the spider-ring. Upon the screw 9 is mounted a circular damper 12. This damper-disk is mounted on the threaded part of the bolt, so that, by rotating it, it may be adjusted upwardly or downwardly, according to the direction of rotation. With this adjustable damper- The object of the present inven-" disk, it will be seen that the amount of air passing either upwardly or downwardly through the ventilating-tube may be regulated. This damper-disk is provided with a notch 13 for engagement of a tool for turning the, disk, to thereby permit the disk to be adjusted without removing the cap 10 orv'loosening the bolt 9. This damper-disk is preferably made, as shown, in a dished form, so that it curves upwardly and outwardly from its center. It is also desirably made less in diameter than the flange 8 and ring 6. i

In concrete or cement floors, it is sometimes desirable to make the flange 8 and the spider-ringti integral and anchor-this integral structure in the cement or concrete.

This form of device is shown in Fig. 3, in which the combined flange and ring is shown at 14 and an anchoring-lug or foot is shown at 15.

After the damper member is adjusted to the desired height on the screw 9, it is locked in position by means of a lock-nut 16 screwed on the screw 9 between the damper member and the spider 6; in this way, the damper members throughout the system are maintained in their respective adjusted positions until a new adjustment thereof is desired. It will be observed also that with my invention the ventilation can be nicely regulated without raising or lowering the mushroom cover-plate. This is obviously highly desirable by reason of the fact that it.-insures all the cover-plates throughout the system being at a uniform height with respect to the floor-ring and floor-surface. y

What I claim is:

1. In a ventilator of the type set forth, a spider-ring and flange, a cover and a central screw for clamping it in place on said flange, and a damper-member threaded on said screw at a pointbelow the cover, for the purpose set forth.

2. In a ventilator of the type set forth, a spider-ring and flange, a cover and a central screw for clamping it in place on said flange, and a damper-member threaded on said screw at a point below the cover, said damper-member consisting of a disk less in diameter than said ring and dished downwardly at its center.

3. In a ventilating apparatus for floors, a conduit and a floor-ring, .a cover-plate for the floor-ring and meansfor supporting it ginal notch for engagement of a tool for turning it in either direction on the screw.

4. In a ventilating; apparatus for floors, a conduit and a floor-ring, a cover plate for the floor-ring and means for sup- IKE-62,865

porting it at a distance above the same, and .a damper member between the cover-plate and the floor-ring and devices for raising and lowering it without affecting the relationship of the cover-plate and the floorring, said devices embodying a screw on which said damper member is threaded for vertical adjustment and a lock-nut on the screw underneath the dampermember.

In testimony whereof I hereunto aflix my signature.

HERBERT L. BROWN. 

